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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Wed, 4 Apr 2007 02:44:00 +0100

> Well the better designed serial setups on Linux use numbering so that you
> can look on the multiplexor boxes and know straight away what the
> correlation between port number and name is. In the same was as "S0 is
> console 1" is nice to have its also nice to have "mux 1 port 4" easily
> calculable not think

If you want hierarchy, create it:

/sys/blah/serial/controllerX/portY

and keeping them all under the ttyS? major keeps the simple
cases working sanely too.